NREMT Advanced EMT Practice Test #4

Answer - C - Basophils are immature mast cells that are important to allergic reactions. Since basophils are white blood cells, they are found within the bloodstream and circulate throughout the body. Once the basophils leave the blood and enter connective tissue, they become a MAST cell. MAST cells are stationary and are located within the walls of connective tissue, respiratory tree, and vascular smooth muscle.